Science & Technology Q&A for Kids (and others) [April 29, 2022]

Stephen Wolfram answers general questions from his viewers about science and technology as part of an unscripted livestream series, also available on YouTube here: https://wolfr.am/youtube-sw-qa Questions include: Considering visual perception discontinuous or discrete, can we also consider it quantized? In that case, could it be calculated as "discrete packets of visual perception," based on quantum physics? - If the level of CO2 was much higher in the past, why wasn't there a runaway greenhouse effect back then? - I looked into it, and apparently limestone rocks absorb carbonic acid in rain and "scrub" the CO2 out of the atmosphere, but it takes forever! - Do the electron orbitals of an atom ever rotate? Do they rotate at the same rate as the nucleus, or can they rotate independently? Is this the same property as electron spin, or is it separate?